UPVC door panels offer a long-term alternative to composite doors. They are durable, efficient and fireproof. They are also inexpensive and easy-to-maintain. The easiest way to fit the cat flap onto a uPVC panel is to purchase a replacement double glazed sealed unit with a pre-cut hole for the flap. https://www.repairmywindowsanddoors.co.uk/ashford-cat-flap-installer-near-me/